煤矸石淋滤重金属析出以及煤矸石回填复垦研究
摘要：随着科学技术的快速发展，能源消耗量日益增加。煤矸石是煤炭采掘和洗选过程中排放的固体废渣，其排矸率约占煤炭开采量的12%，由于煤矸石其产量大，难以回收利用，堆放随意，受水淋滤时析出重金属等有害物质的特性，它已成为工业中生产量、累积量、占地面积最大的固体废料。煤矸石受水淋滤时析出重金属等有害物质是其污染环境最主要途径。因此本文参考了之前众多文献，总结了研究煤矸石淋滤重金属析出的几种实验方案，并考察了不同种类煤矸石之间微量元素含量的不同以及煤矸石用于复垦回填对于复垦地作物的影响。
关键词：煤矸石；重金属；淋滤；微量元素
中图分类号：X131.2 文献标识码：A
Study on Precipitation of Heavy Metals by Coal Gangue Leaching and Backfilling of Coal Gangue
He Xuefeng
(School of civil engineering, Southeast University, Nanjing 210000)
Abstract: With the rapid development of science and technology, energy consumption is increasing. Coal gangue is a solid waste discharged during the process of coal mining and washing. Its drainage rate accounts for about 12% of coal extraction. Having the characteristics of large output, difficulty in recycling, random deposition, and precipitation of heavy metals and other harmful substances when it is leached by water, coal gangue has become the solid waste with the largest amount of production, accumulation, and land occupation in the industry. The most important way for coal gangue to pollute the environment is the precipitation of heavy metals and other harmful substances when it is leached by water. Therefore, this article refers to many previous literatures, summarizes several experimental schemes for studying the precipitation of heavy metals from gangue leaching, and examines the differences in trace element content between different types of coal gangue. Also，the influence of coal gangue to the planting crops on coal gangue filling reclamation is investigated.
Key words: coal gangue; heavy metals; leaching; trace elements
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